本题目来源于试卷: Electric Charge and Electric Field，类别为 IB物理学
[问答题]
Is the electric forcuqxojhy5.- 4lvu21tr f)nrrb2 uc2f.e a g.;9,jksno unconservative force? Why or why not? (See Chapter 6.)
参考答案: The electric force is
conservative. You can “store” energy in
it, and get the energy back. For
example, moving a positive charge close to another stationary positive charge
takes work (similar to lifting an object in the Earth’s gravitational field),
but if the positive charge is then released, it will gain kinetic energy and
move away from the “stored energy” location (like dropping an object in the
Earth’s gravitational field). Another
argument is that the mathematical form of Coulomb’s law is identical to that of
Newton’s law of
universal gravitation. We know that
gravity is conservative, and so we would assume that the electric force is also
conservative. There are other
indications as well. If you move a
charge around in an electric field, eventually returning to the starting
position, the net work done will be 0 J.
The work done in moving a charge around in an electric field is path
independent – all that matters is the starting and ending locations. All of these are indications of a
conservative force.
本题详细解析:
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